Write a function of $x$ for each rule given.

a$)$ Multiplies the input by $7$ and then adds $5$

$f(x)=$

b$)$ Adds $5$ to the input and then multiplies by $7$

$f(x)=$

c$)$ Divides the input by $3$ and then subtracts $6$

$f(x)=$

d$)$ Subtracts $6$ from the input and then divides by $3$

$f(x)=$